Granted, this is a rant:
First, it only supports a subset of Canon's video-capable cameras: 1Dc, 1Dx, 5D Mk III, 6D, 7D Mk II, and 70D.
Second, it will only merge clips from the 1Dc or the 70D Mk II...which is the single most important task anyone would specifically need this kind of camera-manufacturer video utility to perform.
Considering the 4gig limit for DSLR video clips, why for that matter does the task of merging them seem to be an afterthought relegated to obscure third-party utility programs? It's a clumsy operation even in Premiere Pro.
Search for "split a clip" and everybody does that, but search for joining, merging, or concatenating a clip and only third-party utilities readily step up to that plate.